Development of the Resonant-Frequency Monitoring System for the PEFP DTL

Development of the Resonant-Frequency Monitoring System for the PEFP DTL Young-Gi Song, Han-Sung Kim, Hyeok-Jung Kwon and Yong-Sub Cho Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon 305-353 (Received 4 September 2008) A 20-MeV, 20-mA proton linac, which is comprised of a 50-keV proton injector, a 3-MeV radio frequency quadrupole (RFQ) and 20-MeV drift tube linac (DTL), has been developed in the Proton Engineering Frontier Project (PEFP). For a stable and e cient acceleration of a proton beam, the resonant frequency of the DTL cavities should be matched to the high power RF driving frequency. In PEFP DTL, a resonant control cooling system (RCCS) will be used to control the resonant frequency. The main objective of this study is to measure and transfer the resonance frequency error to the RCCS by measuring the RF eld pro le in the cavity. The algorithm derived by using a state-space model is used to represent the resonant frequency error. The control application program was developed with a VME-based PCI mezzanine card (PMC) extended board and a multitasking method based on the VxWorks. We tested the algorithm, the control board and the application program by using a dummy cavity. In this paper, the algorithm, the system con guration and the test results are presented. PACS numbers: 29.17.+w